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HI,i am wondering if anybody else has or had this problem, in flight when I get to cruise speed around 5000rpm I will sometime feel in the rudder pedal very random and no particular rhythm some light kicks, I have no drop in rpm or change of sound from the engine...

Just aircraft, Escapade with a 912/80.

 

Thanks

 

Toby

  • Re: light kicks in the rudder pedal

    by » 7 months ago


    I doubt its a Rotax 9 engine issue.

    Could be you have something loose on the airframe/skin.


  • Re: light kicks in the rudder pedal

    by » 7 months ago


     it could be a airframe issue... I know it's not a carb issue, I was thinking a electrical problem, timing? Misfire? possible ?

    Thanks

     


  • Re: light kicks in the rudder pedal

    by » 7 months ago


    The way you have described the symptoms

    "...feel in the rudder pedal very random and no particular rhythm some light kicks, I have no drop in rpm or change of sound from the engine..."

    does not come across as an engine issue.

    The lack of rhythm or enginenote/vibration change, the location (rudder) suggest something to do with airframe - could be internal or more likely external.

    I am not familiar with your aircraft but from the photos, it looks to be largely fabric covered, including controls surfaces - I would advise a careful inspection of the fabric - looking for adhesion failures - how long since it was (re) covered?

     


  • Re: light kicks in the rudder pedal

    by » 7 months ago


    I had this problem in the past on a Tecnam Sierra powered by a Rotax 912ULS (100Hp).

    Those light kicks are usually sign of one cylinder misfiring or having anyway some combustion issues. In my case I later discovered it was caused by water deposit in the carburator sumps.

    I recommend you open them and check whether for whatever reason water arrived there.

    for me the issue was caused by the water separator funnel I was using for refueling, loosing his water separation capacity due to long term exposure to Italian MOGAS.


    Thank you said by: Toby Gendron

  • Re: light kicks in the rudder pedal

    by » 7 months ago


    Is this a nose-wheel aircraft or a tail-wheel aircraft?  In-flight rotation of the nose-wheel might cause some rhythmic pulsations through the rudder pedals.


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